<template>
  <div>
    <el-container>
      <!-- 头部 -->
      <el-header>
        <div>
          <img src="@/assets/heima.png" alt="" />
          <span>电商后台管理系统</span>
        </div>
        <el-button type="info" @click="logOut()">退出登录</el-button>
      </el-header>
      <!-- 主体 -->
      <el-container>
        <!-- 整个侧边栏 -->
        <el-aside :width="isCollapse ? '64px' : '200px'">
            <div class="toggle-button" @click="toggleCollapse">展开|折叠</div>
          <el-menu
            background-color="#333744"
            text-color="#fff"
            active-text-color="#409BFF"
            style="border-right:none"
            :collapse="isCollapse"
            :collapse-transition="false" 
            router
            :default-active="activePath"
          >
          <!-- 一级菜单 -->
            <el-submenu :index="item.id+''" v-for="item in menuList" :key="item.id">
                <!-- 一级菜单模板区域 -->
              <template slot="title">
                <!-- 图标 -->
                <i :class="iconsObj[item.id]"></i>
                <!-- 文本 -->
                <span>{{item.authName}}</span>
              </template>
            <!-- 二级菜单 -->
            <el-menu-item  @click="saveNavState('/'+subItem.path)" :index="'/'+subItem.path" v-for="subItem in item.children" :key="subItem.id">
                <i class="el-icon-menu"></i>
                <span>{{subItem.authName}}</span>
            </el-menu-item>
            </el-submenu>
          </el-menu>
        </el-aside>
        <!-- 右侧 -->
        <el-main>
            <router-view></router-view>
        </el-main>
      </el-container>
    </el-container>
  </div>
</template>

<script>
export default {
  name: "Home",
  data(){
    return {
        menuList: [],
        iconsObj:{
            '125':'el-icon-s-custom',
            '103':'el-icon-suitcase',
            '101':'el-icon-shopping-bag-1',
            '102':'el-icon-edit-outline',
            '145':'el-icon-tickets',
        },
        // 是否折叠
        isCollapse: false,
        state:'',
        //被激活的地址
        activePath:'',
    }
  },
  created(){
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    //退出登录
    logOut() {
      window.sessionStorage.clear();
      this.$router.push("/login");
    },
    async getMenuList(){
    const {data:res} = await this.$http.get('menus')
    if(res.meta.status !== 200) return this.$message.error(res.meta.msg)
    this.menuList = res.data
    },
    // 折叠菜单
    toggleCollapse(){
        this.isCollapse = !this.isCollapse
    },
    //保存链接的激活状态
    saveNavState(activePath){
      window.sessionStorage.setItem('activePath',activePath)
      this.activePath = activePath 
    }
  }
}
</script>

<style>
.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 20px;
  color: #eaedf1;
}

.el-header > div {
  display: flex;
  align-items: center;
}

.el-header div img {
  margin-right: 15px;
}

.el-aside {
  background-color: #333744;
  height: 100vh;
}

.el-main {
  background-color: #eaedf1;
}

.toggle-button {
    background-color: #4A5064;
    text-align: center;
    font-size: 10px;
    line-height: 40px;
    height: 40px;
    color: aliceblue;
    /* 字符间距 */
    letter-spacing: 0.2em;
    /* 鼠标变小手 */
    cursor: pointer;
}
</style>